Synergized carbamate insecticide

ABSTRACT

New and improved insecticidal compositions are provided from the group of insecticides generally referred to as &#39;&#39;&#39;&#39;carbamate type&#39;&#39;&#39;&#39; insecticides, when these carbamate insecticides are combined with selected synergists. The novel insecticidal compositions are particularly effective against non-flying insect pests and exhibit superior residual kill activity against such pests over unsynergized compositions.

United States Patent [191 Shaver et a].

[ June 3, 1975 SYNERGIZED CARBAMATE INSECTICIDE [751' Inventors: Henry W. Shaver, New York;

William Schmidt, Sea Cliff; Murray W. Winicov, Flushing, all of NY.

[73] Assignee: West Laboratories, Inc., Long Island City, NY.

22 Filed: Apr. 19, 1972 21 Appl. No; 245,624

[52] US. Cl. 424/300; 424/278; 424/312 [51] Int. Cl A0ln 9/20 [58] Field of Search 424/300, 278, 195, 95,

[56] References Cited FOREIGN PATENTS OR APPLICATIONS 676,776 8/1952 United Kingdom OTHER PUBLICATIONS Pesticide Index, Frear, p. 49, 4th ed., (1969). Chemical Abstracts, 75:75266y (1971 Primary ExaminerAlbert T. Meyers Assistant ExaminerLeonard Schenkman Attorney, Agent, or Firm-Howard E. Thompson, Jr.

[57] ABSTRACT 2 Claims, No Drawings 1 SYNERGIZED CARBAMATE INSECTICHDE This invention relates to new and improved carbamate-type insecticidal compositions which contain selected synergists. The insecticidal compositions are particularly effective against non-flying insect pests such as roaches and exhibit superior residual kill activity against such pests.

BACKGROUND OF THE INVENTION A great deal of prior art exists pertaining to synergized insecticide formulations useful against flying in-- sects but little prior art exists relating to synergized insecticides useful against non-flying insects such as roaches. The former type insecticide usually comprises pyrethrins which are employed with certain synergists such as piperonyl butoxide (PBO), piperonal bis (2-(2- butoxy-ethoxy)ethyl) acetal available under the Trademark Tropital, N-octyl bycycloheptene dicarboximide, available under the Trademark MGK-264, N-.

octyl sulfoxide of isosafrole, known as Sulfoxide, and the like.

Previous attempts have been made to employ such synergists with pyrethrins to provide an insecticide useful against non-flying pests. Typical of the literature directed to this type insecticide is that authored by Eileen J. Incho, entitled Ratios ofPBO and Pyrelhrinsfor German Cockroach Control, Soap and San. Chem., February, 1952.

Some of the residual type insecticides which have been used against non-flying insect pests are based on carbamates such as o-isopropoxy-phenyl methylcarbamate, available under the Trademark Baygon, 2-( 1,3 dioxolane-Z-yl)-phenyl-N-methyl carbamate, available under the Trademark Famid, and the like. Prior art literature relating to the use of synergists in such insecticide compositions, however, is scant since the use of synergists in this type of insecticide does not appear to have the same degree of effectiveness as those used with the pyrethrins. An interesting article relating to this observation is that authored by J. C. Keller, et al. entitled Susceptibility of Insecticide-Resistant Cockroaches t Pyrethrins, in Pest Control. November, 1956.

Although the list of commercially available organic insecticides, both proven and experimental, is extensive (See Bulletin of the Entomological Society ofAmerica, vol. 12, No. 2, pp. 161217, June, 1966), there are few that are completely effective against non-flying insect pests; that is, which are not only effective for their intended use, but which are safe and commercially feasible.

THE INVENTION It has now been found that improved carbamate-type insecticides can be provided which are effective against nonflying insect pests and yet are safe to use and are commercially feasible. According to the present invention, these insecticides can be obtained by providing an insecticidal composition which generally comprises a carbamate and, as selected synergists, piperonyl butoxide (PBO), piperonal bis (2-(2-butoxyethoxyl)ethyl) acetal (Tropital) and a vegetable oil or fat. The selected synergists, added in proper amounts, significantly improve the knockdown and mortality rate of known prior art carbamate-type insecticides employed against non-flying, or crawling, insects and pests.

As employed throughout this disclosure and in the appended claims, it should be understood that the term carbamate-type insecticides is intended to refer to those carbamate-containing compositions generally employed as insecticides including, but not limited to, the carbamates referred to hereinabove and identified by their Trademarks as Baygon and Famid and which typically contain extenders, such as hydrocarbon solvents, perfumes, and solubilizing agents.

The terms fat and vegetable oil" as employed throughout this application, including the appended claims, should be understood as referring to those fats and oils present as glycerides and falling within the definition of fats as being A glycerol ester of fatty acid(s): Fats generally are substances of plant and animal origin. Fat may be in solid form, as tallow, lard, butter, margarin or other shortenings, or in liquid form, as vegetable oils.

The glycerol esters are predominately of the triglyceride type, although vegetable oils and fats may also contain some diand even mono-glycerides. The fatty acid component of fats and vegetable oils encompass the range of fatty acids containing from about 8 to 22 carbon atoms, primarily in the range of C and C Although most of the fatty acid content is saturated linear alkanoic acid, some of the fatty acid content may be unsaturated, as exemplified by oleic and linoleic acid. Examples of fats and oils suitable for the purpose of our invention are coconut oil, peanut oil, corn oil, cottonseed oil, olive oil, soybean oil, sesame oil, tallow, butter fat, etc.

Although fats naturally obtainable in solid form can be utilized in the insecticidal composition of the invention, those which are normally liquid at room temperature, such as the vegetable oils, are preferred, and of these, coconut oil is particularly preferred.

To obtain the insecticidal composition of the invention, a typical carbamate-type insecticide formulation is first dissolved in a suitable solvent, to which the particular synergist combination of the invention is added and blended therein by stirring, either manually or by means of an appropriate mechanical stirrer, until a homogeneous mixture is obtained. The synergist composition can either be uniformly blended before being added to the carbamate-type insecticide formulation, or each synergist comprising the synergist composition can be added separately thereto. The procedure followed is not critical as essentially the same results will be obtained. 1

With respect to the synergists employed, it has been found that they should each be present in the insecticidal composition in an amount no less than about 0.5% by weight, based upon the total weight of the composition when it contains 1% carbamate insecti cide. Stated in another way, the ratio of synergists employed to carbamate insecticide should be no less than 0.5:1. For optimum results of insecticide effectiveness and economic production, the synergists of this invention should be present at a ratio range of from about 0.5:1 to 5:1. Although greater amounts of all synergists can be employed, it has been found that the performance of the insecticide is not materially improved.

The carbamate-type insecticidal composition of the invention was subjected to comparative analyses wherein a carbamate insecticide formulation without synergists and formulations containing varying amounts of the particular synergists of the invention as well as others containing different synergists were utilized. The results for the comparative analyses were ob- Treated papers are aged in cardboard cartons for one week prior to testing. Ten filter papers, all treated with the same insecticide, are stored in one carton. Papers should be fastened to the string inside the box with Z R i F2 l s h j of lg g g Cock 5 paper clips and spaced approximately 1 /2 inches apart. ua er prescn e y a l' Filled boxes are stored at a temperature of 82F. i2F., m ttee of Chemical Specialties Manufacturers Associand a relative humidity of i anon (CSMA), an outline of the test method being set Test Procedure forth below Place lucite cylinders in center of each filter paper. Test 10 Place 2 clean three-inch squares of glass in the center The test insects shall be healthy, normal undeformed of each cylinder, one Spaced 3 1 inches above h adul? malfis of the German cockroach Blanella other with spacers at each corner. Position of the lower mamca -l" Recellfly Fmerged adult males square should be marked on the filter paper to aid locathose whose pigmentation is not dark, shall not be used tion in Subsequent exposure for testing p p It is {ecommended that the adult Place 10 male cockroaches, anaesthetized with carstage shall have been attained at least three days and bon dioxide on each upper glass paneL Cover Cylinders 9 g 30 days l)nor to testmg' with screen covers. Test cylinders should be held in a eslmg quiet area at a temperature of 82F. 1 2F., and a rela- This room y be of y Convenient Size permitting tive humidity of 50% i 5%. Test cylinders should not adequate space for the operator to handle the test and be exposed to direct li h equipment efficiently. While tests are being conducted R d d d d ib d roaches t 24 ho r this room shall be maintained at a temperature of 82F. Af h t st lucite cylinders glass plates and and a relative humididty 0f 50% i The tests spacers should be iemoved from the treated papers and should not be exposed to direct sunlight and in an area 25 washed in a detergent and hot water. They should be 0f r latively Still air. placed in storage until the succeeding test. Between Test Equipment tests, treated filter papers will be stored in their respecl. Whatman No. 3 filter papers, 18.5 cm. in diameter. tive storage cartons and held under conditions identical 2. Glass slides, 3 inches by 3 inches square. to storage during the first week aging. 3. 3/16 inch metal spacers. The carbamate-type insecticide of the invention will 4. Aluminum foil. become more clear when considered in light of the fol 5. Lucite cylinders 5 inches in diameter and 2 lowing Examples which are set forth as being illustrainches high, /8 inch wall thickness. tive and should not be construed as being limitative of g g Colvnial Koloflite p yi 2232 Armitage Avenue the invention. Unless otherwise indicated, all parts and icago,

ercenta es are b wel ht. 6. Suitable screen cell covers, 14 mesh stainless steel p g y g screens, 5 inches in diameter. EXAMPLE 1 u i ig l g g f i 14 mcfhes X 14 A plurality of insecticidal compositions were prei i l 6 avmg a V0 ume approx' pared containing various amounts of synergists. The ef- P 3. gg ee t 40 ficacy of these compositions were then determined acreparadlgn Orage d cording to the CSMA test procedures described hereincar ogrficartons to f is b or agmg g Stor' above. The results obtained are tabulated below f t e treate 1 wt S i e prepare y l' wherein the basic, carbamate-type insecticide formulatmg two l m each slde 11/2 mches Square approx: tion shown therein and identified by the letters S.C. Ynately l [a Inches from the the canon and 3 /2 consisted of the following components and ingredients: inches from the corners. A strlng is attached to two opposite sides, 4 /2 inches from the top. When in use, boxes should be sealed at the bottom with gummed paper tape. The top should be tightly closed but not Component by weight sealed.

5O o-isopropoxyphenyl Preparatlon of Test Panels methylcarbamate (Eamon) 105 Place circles of filter paper over a base of aluminum But I Cellosolve 15.00 foil. Pipette 1.5 ml. of test solution over the filter paper, 2%; wetting it evenly. Treat l0 circles of filter paper with T0030 each insecticide to be tested. For each sample tested Specific gravity at F. 0.798 leave 2 untreated papers as controls. we'ght lbsJgal' TABLE 1 Efficacy of Carbamatc-Type Insecticides as Determined by Modified CSMA Test Method Residue Knockdown Mortality lnsecticide Composition Age (days) I hr. 2 hrs. in 24 hrs.

(l)* Sf. (no syncrgists l 23 7: 38% 91% added) 7 2% 10% 6671 (2) SC. 271 Tropitul l 44% 667! 95% 7 5% W71 75% 3) 5.0 2% PBO 1 50% 67% 92% i 7 new 29%; 83

TABLE l Continued Efficacy of carbamate-Type Insecticides as Determined by Modified CSMA Test Method Residue Knockdown Mortality Insecticide Composition Age (days) 1 hr. 2 hrs. in 24 hrs.

(4) S.C. 1/2% Coconut oil 1 40% 80% 100% 7 8% 36% 90% (5) S.C. 1% Tropital and 1 48% 65% 96% 1% PBO 7 10% 80% (6) S.C. 1% Tropital and l 50% 74% 98% 1% Coconut oil 7 10% 26% 83% (7) S.C. 1% PBO and 1 48% 76% 98% 1% Coconut oil 7 12% 28% 84% (8) S.C. 1% Tropital, l 58% 80% 100% 1% P130 7 16% 34% 85% 1% Coconut oil (9) S.C. 2% Coconut oil 1 46% 60% 100% 7 24% 50% 92% (10) S.C. 2% Tallow 1 44% 52% 98% 7 18% 37% 77% (l 1) S.C. 2% Olive Oil 1 44% 59% 100% 7 51% 91% (12) S.C. 2.5% Peanut Oil 1 43% 62% 99% 7 21% 88% *Avcragc of 5 separate runs EXAMPLE I! An emulsifiable concentrate, suitable for dilution with water, was prepared containing:

13.9% Baygon 15.0% Emulsifier qs 100% with trichloroethylene/ methylene chloride as solvent at a ratio of 37 :27, respecitvely.

A second concentrate was prepared, in which 7% coconut oil was incorporated in the formula, replacing a similar portion of the solvent.

13.9% Baygon 7.0% Coconut oil 15.0% Emulsifier 'qs 100% with trichloroethylene/methylene chloride as solvent at a ratio of 37 :27, respectively.

Dilutions of each composition in water were made to provide 1% active Baygon, and both dilutions were then tested using the tenative CSMA insecticidal test method described above. The second formula, containing the coconut oil, gave distinctly superior performance with respect to both knockdown and 24 hour mortality, compared with the first formula.

From the Examples shown hereinabove, it can be seen that the efficacy of carbamate-type insecticides is materially and significantly improved when the synergists of the invention are incorporated therein. This is dramatically represented by the results shown in Table I.

In lieu of employing the carbamate Baygon, the carbamate Famid can be utilized to prepare insecticidal compositions of the invention and some representative formulations incorporating Famid are illustrated in Table II below.

While the insecticidal composition of the invention has been described with particularity and in some detail, it should be understood that it is subject to changes, modifications and variations within the scope of the invention.

What is claimed is:

1. An insecticidal composition for use against nonflying insect pests comprising the carbamate insecticide o-isopropoxyphenyl methylcarbamate and a synergist which is a glycerol ester of C to C fatty acids, the proportions of said synergist to said carbamate insecticide being within the range of about 0.521 to 25:1 on a weight basis.

2. The insecticidal composition of claim 1 wherein said synergist is coconut oil. 

1. AN INSECTICIDAL COMPOSITION FOR USE AGAINST NON-FLYING INSECT PESTS COMPRISING THE CARBAMATE INSECTICIDE OISOPROPOXYPHENYL METHYLCARNAMATE AND A SYNERGIST WHICH IS A GLYCEROL ESTER OF C8 TO C22 FATTY ACIDS, THE PROPORTIONS OF SAID SYNERGIST TO SAID CARBAMATE INSECTICIDE BEING WITHIN THE RANGE OF ABOUT 0.:1 TO 2.5:1 ON A WEIGHT BASIS.
 1. An insecticidal composition for use against non-flying insect pests comprising the carbamate insecticide o-isopropoxyphenyl methylcarbamate and a synergist which is a glycerol ester of C8 to C22 fatty acids, the proportions of said synergist to said carbamate insecticide being within the range of about 0.5:1 to 2.5:1 on a weight basis. 